Does anyone know what an "Advanced Pulse Digital Converter" is? (Sony CXD8505Q - CXD2515Q). It is in a Sony CDP-XA1ES. IIRC, either the JA20ES or JB930 has the 8505BQ DAC, which is a current pulse. So what is the difference between a "current pulse" and "advanced pulse" DAC? Is "advanced somehow different from "hybrid"? I'm no EE, so the simpler the explanation, the better. I am not being lazy here, as I did some poking around on the web, but did not find anything comprehensible to me.